orderly, natural changes and species replacement that take place in communities

11.

direct physical observation of a thing or process

15.

part of DNA that codes for a protein

16.

this biome gets at least 200 cm of rain per year

18.

-cide

20.

plants lose water through their leaves

24.

this natural process is used to convert N in the air to a usable form

26.

-pod

28.

an organism that eats other animals

29.

movement of people out of a population

30.

substances that are unstable and give off radiation

32.

point of attachment in the middle of a chromosome

34.

most abundant element in the human body

35.

difference between birth rate and death rate

37.

part of all amino acids

38.

branch of biology that studies the classification of living things

39.

organism thatfeeds on dead matter but used the nutrients for itself

41.

a way of knowing about our natural world

44.

coastal body of water partially surrounded by land where freshwater meets salt water

46.

the only cycle that does not use the atmosphere

47.

detoxifies the body and fights arthritis and aging

50.

populations of different species that occupy the same area and interact

52.

most of the biomass on the marine biomes

53.

organism that must eat other organisms to obtain energy and nutrients

54.

ability of an organism to withstand fluctuation in biotic and abiotic environmental factors

55.

protons and neutrons are found here

Down

1.

grassland in Russia

2.

deeper zone in marine biomes in which sunlight can't reach

4.

factor that determine whether or not an organism can live in an area

5.

breaking down and building up of molecues in teh body

6.

an increase in size of a population over time

7.

mass of underground mat of roots in a grassland

8.

role and position a species has in its environment

10.

systematic way of solving problems

12.

repeating sequence of cell growth and division

13.

advantage for a species to occupy a different niche from other species is to reduce ____

14.

population growth depends mainly on this type of pattern

17.

movement of people into a populatin

19.

consumer of producers

21.

biome that has temperature always below freezing

22.

maintains blood volume, pH level, and blood pressure

23.

traits are carried on this

25.

air is 78% this gas

27.

building blocks of nucleic acids

31.

branch of biology that studies the interaction of living things

33.

biome that is also called the northern coniferous forest

36.

study of human population growth characteristics

40.

fitlers wastes from kidneys

41.

grassland in Africa

42.

-gen

43.

part of Earth that supports life

45.

enzymes, hormones, and antibodies are these

47.

group of genetically similar organisms that can produce fertile offspring

48.

ecological or environmental area where a species lives

49.

common plants found in areas of early primary succession

50.

highly organize, tiny structures that all living things are made of

51.

osteo-

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